If object creation is done in the same order as the insertion: surely a simple static counter in the class would give you the required monotonous value.
Otherwise, a listener could be set, which will "see" the actual order of insertion, and it can set the order-of-insertion property. -W On 07/02/2013, Sandjaja, Dominik <dominik.sandj...@it-motive.de> wrote: > Hi everybody, > > short: is there a way to have an automatic counter for the RHS of a rule > when inserting several objects in one rule? > > Long: > I use drools with a DSL to insert items for a frontend dropdown box. The > generated rule is e.g. like the following one: > > rule "testRule_H" > dialect "mvel" > when > SomePartOfMyModel( someField == "H" ) > then > DropDownItem fact1 = new DropDownItem(); > fact1.setLabel( "My Label 1" ); fact1.setValue( "B" ); > > insert (fact1); > DropDownItem fact1 = new DropDownItem(); > fact1.setLabel( "My Label 2" ); fact1.setValue( "A" ); > > insert (fact1); > > This works nicely and I get all the items. The problem I have is with the > sorting. Users use Guvnor to edit the available items for the dropdown box, > so they add and remove items from the RHS. Since I retrieve those objects > from the knowledge base in my java code like this: > > Collection<FactHandle> handles = statefulKnowledgeSession.getFactHandles(new > ClassObjectFilter(DropDownItem.class)); > for (FactHandle handle : handles) { > DropDownItem selectItem = (DropDownItem) > statefulKnowledgeSession.getObject(handle); > ... > > I think I cannot be sure about the order the objects are retrieved (it's a > collection, no guaranteed sorting!). So, I sort the DropDownItems > alphabetically by their value. > > My question now is, as stated above: How can I implement a counter which I > can use in the facts being inserted to keep my inserted facts > (DropDownItems) in the same order as they are inserted? > > Thanks in advance > Dominik > > ………………………………………………………………… > mit freundlichen Grüßen / kind regards > Dominik Sandjaja > Fon: +49 (0) 203 60878 183 > Fax: +49 (0) 203 60878 222 > e-mail: dominik.sandj...@it-motive.de > > it-motive AG > Zum Walkmüller 10-12 > 47269 Duisburg > i...@it-motive.de > http://www.it-motive.de > …………………………………………………………………… > Vorsitzender des Aufsichtsrats: Dipl.-Ing. Klaus Straub > Vorstand: Horst-Dieter Deelmann (Vors.), Matthias Heming, Christoph Tim > Klose > HRB 9207, Amtsgericht Duisburg > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users